Compleated is an interesting mechanic, but I'm going to have to see more of it before I evaluate. Phyrexian mana was cracked in half on the good cards, but Phyrexian mana with a drawback of you pay the reduced cost is interesting design space. The problem is that you have to get something that's reasonable on both mana values.

This Tamiyo for instance looks mostly playable at 4 mana, Ajani Vengeant was decent for example, but at 5 mana with 3 colored pips Tamiyo looks a lot less interesting unless the new standard environment is incredibly slow. The flexibility makes it a little more complicated, but I honestly don't think the 5 mana version is good.